Key-action for type-writing machines.



PATENTED MAY 12, 1903.

R. J. FISHER. KEY ACTION FOR TYPE WRITING MACHINES.

APPLIOATION FILED JUNE 21, 1901;

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N0 MODEL m: Norms pzt'sns ca. PHOYO-LITHCL. WA$HINGTON. a. c.

No. 727,607. PATENTED MAY 12, 1903.

R. J. FISHER.

KEY ACTION FOR. TYPE WRITING MACHINES.

Agrmon'xon rmm JUNE 21, 1901. no M01139 4 sunrs-snmir 2.

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PATENTED MAY 12. 1903.

R. J. FISHER.

KEY ACTION FOR TYPE WRITING MACHINES.

APPLIOATION FILED JUNE 21, 1901.

4 SHEETSBHEET 3.

NO MODEL.

No. 727,607. PATENTED MAY 12, 1903. R. J. FISHER. 7

KEY ACTION FOR TYPE WRITING M AOHINE S APPLIOATIONIILED mm 21, 1901. 30MODEL; mums-sum 4.

THE uonms PETERS c0, more-Lure wAmmsTou, n, c,

Patented May 12, 1909;.

T Fries.

ROBERT JOSEPH FISHER, OF ATHENS, TENNESSEE, ASSIGNOR TO THE FISHER BOOKTYPEWRITER COMPANY, OF CLEVELAND, OI'IIO, A

CORPORATION OF DELAWVARE.

KEY-ACTION FO'R .TYPlE-WRITING MACH N ES.

SPECIFIUATION forming part of Letters Patent No. 727,607, dated May 12,1903.

Application filed June 21, 1901. Serial No. 65,467. (No model.)

To all whom, it may concern:

Be it known that I, ROBERT JOSEPH FISHER, a citizen of the UnitedStates, residing at Athens, in the county of McMinn and State ofTennessee, have invented a new and useful Key-Action for Type-WritingMachines, of which the following is a specification.

My present invention "relates to improvementsin type-writing machines,but has more especial reference to the improvement of thetype-bar-operating mechanism.

In all types or classes of type-writing machines embodying movable keysfor operating the type-bars it is desirable to produce the lightestpossible touch and to eliminate the jarincident to the startingandstopping of the type-bar, and it is furthermore desirable to absolutelyeliminate all rebound of the typebar after it has reached its retractedposition. The shocks which the operator usually re ceives from the quickor staccato blow upon the key are (1 no to the'inertia of the type-bar,which offers resistance to being suddenly put in motion and tothe suddenarrest of the op erators finger by reason of the contact of the typewith the platen. These shocks are comparatively slight; but the vastrepetition thereof incidental to the operation of the type-writingmachine renders their elimination a matter of some importance. Therebounding of the type-bars after their retrac-' tion is highlyundesirable, for the reason that the type-bars so rebounding interferewith the type-bars being operated, and thus prevent the rapidmanipulation of the printing mechanism. 7 V p p v The present in ventionis especially designed for use in connection with type-writing machineswhose type-bars strike downwardly, because the tendency of the barstogravitate from their retracted positions is apt to produce a greaterrebound than in those types of machines wherein the force of gravitytends to retain the type-bar in the position to which it is moved afterthe printing operation. More particularly, however, the invention iscontemplated for use in connection with the Fisher type-writing machine,a form of which is disclosed in my former patent, No. 569,626,

which machine is of the type jnstmentioned,

and is furthermore equipped with a type-head of that form disclosed inmy concurrent application, Serial No. 28,419, filed August 29, 1900. Forthe purpose of illustrating the application of the invention, therefore,it is shown applied to a Fisher type-Writing machine; but it will ofcourse be understood that any other machine employing type-bars may beequipped with the improvements contemplated by this invention. 7

The object of the invention, briefly stated, is to lighten the touch byminimizing or practically eliminating the shocks at the beginning andending of the key-stroke and to antomatically lock the type-bar in itsretracted position to prevent it from rebounding upon its suddenretraction after it has been pre sented to the platen.

To the accomplishment of these ends the invention contemplates theinterposition, in the line of connectionbetween the key element and thetype-bar, of a motion-transmitting element which will serve to lightenthe load opposed to the key element at the beginning of the strokeand tograduallyincrease the load after the inertia of the type-bar has beenovercomethat is to say, the interposition of the motion-transmittingelement is effected in a manner to transmit the motion from the keyelement to the type-bar in varying ratio, the type-bar being moved adistance of, say, one-fourth of its stroke during the first half of thestroke of the key element, the ratio of movement being thenautomatically varied to cause an acceleration of the transmittedmovement, so that the last half or less of the key-stroke will effectthe movement of the type-bar a distance of, say, three-quarters of itsstroke. Thus the initial movement of the key being comparatively greatto effect the starting of the type-bar, the shock incident to theovercoming of the inertia of the typebar is practically eliminated, andas the in-' crease of the load during the movement of the type-bar isgradual such increase is imperceptible to the operator and serves toabsorb the movement of the hand and to minimize the shock occurring atthe impact of the type upon the platen.

The means for effecting the several ends stated comprehends theemployment of a motion-transmitting element preferably having the formof a bell-crank lever interposed, as already remarked, in the line ofconnection between the key element and the type-bar, but preferably inthe draw-wire connecting the rear end of the key-lever with the rear orlower extremity of the type bar or lever. The fulcrum of the bell-cranklever is fixed, and said lever is connected at separated points to thecontiguous ends of the draw-rod sections or to other connecting members,the fulcrum and the points of connection being disposed in triangulararrangement, so that said points of connection will move through arcshaving angular relation. The effect of this arrangement of the fulcrumand points of connection is that while said points move through the samenumber of degrees the movements of the connected elements in a givendirection will be of different extent. In other words, the bell-cranklever is so arranged-' as, forinstance, in the illustrated embodimentthereofthat one point of connection will move through a horizontal arcwhile the other point of connection moves through a vertical arc duringthe swinging of the bell-crank lever upon its fulcrum, and as aconsequence one point of connection will have considerable verticalmovement, while the other point of connection will have comparativelyslight vertical movement, by reason of the fact that the major portionof the movement of said last-named element will be absorbed by itstravel in a horizontal direction. The bell-crank lever thus employed isalso disposed so as to normally bring its point of connection with thedriven element in looking arrangement with the fulcru m of thebell-crank lever-that is to say,

in such relation to the fulcrum as would bring the strain from therebounding tendency of the type-bar directly in line with said fulcrum,whereby said fulcrum will effectually resist any rebounding movement ofthe type-bar, but will offer no resistance to theswinging of thebell-crank lever to cause the actuation'of the type-bar under theimpulse of the key element.

The invention further consists in certain details of construction andarrangement, all as will be more fully described hereinafter,illustrated in the accompanying drawings, and succinctly delined in theappended claims;

In said drawings, Figure l is a sectional view'of the traveling typecarriage of a Fisher type-writing machine equipped withtype-bar-operating mechanism constructed in accordance with myinvention. Fig. 2 is a similar view with the type-basket removed andshowing a diiferent arrangement of the power-transmitting element. Fig.3 is asimilar view showing still another embodiment of the invention.Figs. 4, 5, and 6 are diagrammatical views illlustrating the movementsofthe power transmitting element when mounted in accordance with the constructions shown in Figs. 1, 2, and 3, respectively. Fig. 7 is a view ofstill another arrangement of the power transmitting element. Fig. 8 is adiagrammatical viewillustrating the movements thereof, and Fig. 9 is adetail view of a possible variation in the form of thepower-transmitting element or lever.

Like numerals are employed to designate corresponding parts throughoutthe views.

The front and rear elevated guides l and 2 of the travelingmachine-frame (illustrated fragmentarilyin Fig. 1) support in the usualmanner the type-carriage 3, usually in the form of a hollow casing, asshown, and supporting thependent frame 4 of the type-basket. \Vithin thecasing 3 are pivotally mounted in a manner well understood in the art aseries of key-levers 5 of the first class, pivotally connected at theirfrontendsto the key-stems 6, fitted with suitable keys 7, hearing acharacter or characters corresponding with the type or types operated bythe typebar 8, to which the individual key-lever is operatively related.

In the type of machine illustrated in the drawings the type are designedto impact against the horizontal writing-surface of a platen disposedbelow the type-basket, and are therefore mounted for downward movementwhen a type-key 7 is depressed. The

type-bars 8, which are equipped with the heads 9, described and claimedin my application Serial No. 28,419, are disposed normally in anupstanding position, as shown in Fig. 1, and are fulcrumed adjacent totheir lower ends, as indicated at 10, the lower or rear extremities ofthe type-bars being connected to the rear extremities of the key-levers5 through the medium of vertically-disposed draw-wires 11, comprisingupper and lower sections 12 and 13. the type-bar 8 is retracted withmore or less violence against the buffer-ring 14 under the impulse ofthe retracting-spring 15.

It is well understood by those skilled in the art that the rebounding ofthe type-bar after the retract-ion thereof is objectionable, especiallyif an adjoining type-bar is thrown down immediately after the stroke ofthe type-bar retracted, because in this event the rebound is apt tocause colliding of the typebars to the great annoyance of the operatorand to cause loss of speed. As heretofore explained, the tendency of thetype-bars to rebound is greatest'in machines of that type wherein therebound of the bars is assisted by gravity. Various expedients for overcoming the rebound of the type-bar have been resorted to. One was tomake the bufierring as rigid as possible, and another was to set up amuch greater tension of the return or retracting springs 15 than wasnecessary to merely return the type-bars to their normal positions.The'latter expedient, while overcoming the rebound to a considerableextent, resulted in a comparatively hard touch When the key is released,

mate out increasing the resistance at the key, but

should, on the contrary, be accomplished by means which will vary theresistance in a manner to minimize the shocks imparted to the hand ofthe operator at the beginning and ending of the key-stroke. Thesedesirable results are obtained by the interposition in the line ofconnection between the key element and the type-bar of a bell-cranklever 16, arranged in a particular manner and constituting apower-transmitting element arranged to transmit motion from the keyelement to the type-bar in varying ratio, so that a minimum load orresistance is opposed to the initial movement of the key element and isgradually increased after the inertia of the type-bar has been overcomewithout appreciable shock to the finger of the operator.

In the preferred embodiment of the invention (illustrated in Fig. 1 ofthe drawings) the power-transmitting element or bell-crank lever 16 isfulcrumed at one end upon a bearing-wire 17, supported by suitablebrackets 18, pendent from the bottom 19 of the carriage 3, thebearingwire 17 being sufficiently extensive to accommodate a lever 16for each type-bar 8. As shown in the drawings, the several levers areretained in properly-spaced relation by the interposition of washers orspacing-sleeves 20. The end of the lever 16 opposite its fulcrum 17 isconnected, as indicated at 21, to the upper end of the lower draw-rodsection 13, and the connection of said lever with the lower end of theupper draw-rod section 12 is located at the angle of the lever 16, asindicated at 22. For the purpose of defining these several points ofconnection in the claims I shall define the lever 16 as being providedwith a fulcrum, with a type-bar connection and with a key-elementconnection, and by these latterterms I mean to be understood asindicating those points upon the lever 16 at which it is connectedeither directly or indirectly to the type-bar or key element, as thecase may be. I shall also define the key and the type-bar in certain ofthe claims as driving and driven elements, and in such case the keyconnection and the type-bar connection above identified will be termedthe d living-element connection and the driven-element connection,respectively.

As shown in Fig. 1, the type-bar connection 21 is disposed normallybelow and slightly in rear of the fulcrum 17 of the bell-crank lever toposition the lower section 13 of the draw-wire nearly in line with thefulcrum. Thus the type-bar in its retracted position will be retainedagainst rebounding movement by an automatic lock, as it will appear iii)that any forward movement of the type-bar away from the bufier-ring 14:must be accompanied by an upward longitudinal movement of the draw-wiresection 13, which movement is prevented by reason of the fact that thefulcrum 17 of the bell-crank lever 16 is either located directlyin theline of strain or slightly in front thereof. Therefore when the type-baris retracted violently against the buffer-ring the connection 21 and.the furcrum 17 of the lever 16 are disposed in locking arrangement, andas the draw-wire section 13 is held against upward longitudinal movementthe rebound of the type-bar will be absolutely prevented. It is clear,however, that while the draw-wire section 13 is held against movementand cannot, therefore, yield under power applied thereto from thetype-bar the lever 16 may be readily swung upon its pivot by theapplication of power to the key 7. This is by reason of the fact thatwhen the lever is swung in the manner indicated the first movement ofthe connection 21 will be in a horizontal direction, and such movementwill present the connection 21 in advance of the vertical plane of thefulcrum 17 before the Vertical movement of the connection 21 isappreciable. Thus with the parts in the positions shown in Fig. 1 of thedrawings it is impossible to pull the typebar forward, even thoughconsiderable force is applied, while the application of very slightpressure to the key 7 will cause the key-lever 5 to be oscillated andthe bell-crank lever 16 to be swung to effect the forward or downwardmovement of the type-bar 8. Considered in this aspect alone theinvention is of great practical importance, since the employment of thebell-crank lever in the manner specified provides for the automaticlocking of the type-bar in its retracted position, and therefore permitsa comparatively light retracting-spring to be employed, to the end thatthe touch of the key will be very much lighter than is possible Wherethe retracting mechanism is depended upon to hold the typebar againstthe buffer-ring. As premised, however, there is still another aspect inwhich the invention is possessed of special advantages entirely apartfrom those just noted-- that is to say, the arrangement of the lever 16in the manner specified permits the movement of the type-key to betransmitted to the type-bar in varying ratio, considerable initialmovement of the key being accompanied by comparatively slight movementof the type-bar and the subsequent movement of the key being transmittedto impart a comparatively greater movement to the type-bar.

In Fig. 1 I have illustrated the retracted position of the type-bar infull lines, the position of the type-bar when the key is moved slightlymore than one-half of its stroke in heavy dotted lines, and theimpacting or printing position of -the type-bar at the end of thekey-strokein light dotted. lines, this character of illustration beingadopted for the purpose of showing the relative extent of movement ofthe type-bar and key at different points in the key-stroke. When the keyhas been moved more than one-half of its entire stroke, the type-barwill have moved about one-fourth of its entire stroke, so that whilethere is a loss of speed in the initial movement of the load or type-barthere is a proportionate gain of power. After the inertia has thus beenovercome and the typebar is in motion the arrangement of the bellcranklever is such that the movements of the key and type-bar will beefiected in inverse ratio, and the load will thus be increased; butthere will be a gain in speed.

Thus during the last half of the key-stroke the type-bar will movethrough, say, threefourths of its movement and will create suffieientresistance at the key to absorb in large,

measure the shock which would otherwise be incidental to the impact ofthe the platen.

The transmission of movement from the key to the type-bar in varyingratio has heretofore been effected in several ways, all of which haveinvolved certain sliding connections, which are highly objectionable intypewriter constructions, and where such difierential movement has beensecured it has usually been impossible to secure any locking actionwhich would effectually prevent the rebound of the type-bar. Theemployment of the bell-crank lever 16 in accordance with my invention,however, dispenses with the necessity for the employment of all slidingconnections and at the same time secures both the desired differentialmovement and the automatic locking of the type-bar.

In Fig. 4 is shown a diagram of the lever movements, which eifect theslow movement of the type-bar at first and its subsequent rapid movementafter its inertia has been overcome. Referring now to Fig. 4, it will beseen that normally thevtype-bar connection 21 is located almost directlyunder the fulcrum 17 and that the key connection 22 is located at aconsiderable distance in advance of the fulcrum. Ifnow the key 7 isdepressed one-half of its stroke, the key connection 22 at the angle ofthe bell-crank lever will move through the vertical arc a b, while thetypebar connection 21 will move through the substantially horizontal arec d. The vertical movement of the key connection 22 will thus be fromthe horizontal plane 6 to the horizontal plane fipractically none of themovement of said connection being absorbed by the horizontal or lateraltravel thereof. On the other hand, the movement of the type-barconnection 21, traveling through the substantially horizontal are 0 cl,will be largely absorbed by such lateral movement, and the verticalmovement of the connection 21 will therefore be only from the horizontalplane g to the horizontal plane h, and the dilferential movements of thekey and type-bar secured during this forward movement of the typeagainst lever 16 will be represented by the difierent distances traveledby the connections 21 and 22. in a vertical direction, it beingunnecessary for the purpose of the present illustration to take intoaccount any allowance for the inclination of the draw-wire during themovement of the lever.

It will thus appear that while the upper.

section 12 of the draw-wire 11 moves a distance equal to the intervalbetween the planes 6 and f, the lower section of the draw-wire will moveonly a distance equal to the distance between the planes 9 and h, andthe first half or more of the stroke of the key will therefore result incomparatively slight movement of the type-bar. The change inthe positionof the lever now presents the connections 21 and 22 at the beginning ofreverselydisposed arcsthat is to say, the connection 21 has arrived atthe end of the substantially horizontal are c d and at the beginning ofthe substantially vertical are d '0', while the connection 22 hasarrived at the end of the substantially vertical are a b and at thebeginning of the substantially horizontal are I) k. Continued movementof the bell-crank lever 16 under the impulse of the key will thereforemove the connection 21 from the horizontal plane it to the horizontalplane Z and will simultaneously move the connection 22 from thehorizontal planefto the horizontal plane m. In this instance a reversediiferential movement is secured, and instead of the movement of the keybeing in excess of the movement of the type-bar the movement of thetype-bar is much in excess of the movement of the key, because while thelower drawwire section 13 has moved the distance of the interval betweenthe planes h and Z the upper section 12 of the draw-wire has only movedthe distance between the planesfm.

Instead of locating the bell-crank lever 16 between two sections of thedraw-wire, as illustrated in Fig. 1, it is possible to fulcrum the leverupon a suitable support 23 in the type-carriage, as shown in Fig. 2, andto connect the rear end of the key-lever 5 directly to the lever 16 atthe angle thereof, slight lost motionbeing provided for by means of theslot-and-pin connection 22 as shown. The principle underlying thisapplication of the invention is precisely the same as that alreadydescribed; but in Fig. 5 I have shown a diagram showing the manner inwhich the type-bar connection 21 moves from the plane g to theplane h,and thence to the plane I, while the key connection 22 moves from theplane 6 to the plane f, and thence to the plane m.

A still further embodiment of the invention is shown in Figs. 3 and 6 ofthe drawings, the location of the lever 16 at the front end of thekey-lever 5 instead of at the rear end thereof necessitating thereversal of the position of the bell-crank lever. In this contamerprovided with a slot-and-pin connection 22 at its opposite end with thelever 5 and with a similar slot-and-pin connection 21 at its angle withthe lower end of the key-stem 6. The differential movements of the keyconnection and type-bar connection are the same, however, as in theother forms of the invention, as clearly shown in Fig. 6.

A still further embodiment of the invention is illustrated in Figs. 7and8 of the drawings, wherein the fixed fulcrum 17" of the lever 16 islocated at the angle of the lever instead of at one end thereof, as inthe several forms already described. In this embodiment the lever 16 islocated in the draw-wire, and the type-bar connection 21 and the keyconnection 22 are located at the ends of the lever. When thisarrangement of the powertransmitting lever is employed, the short arm 29and the type-bar connection 21 will bear such relation to the fulcrum 17as will effect the locking of the type-bar against rebounding movement,it being possible in this instance, as in the others, to present thetypebar connection in exact alinement between the fulcrum and theconnection 30 or slightly in rear of the line of strain, as may bedesired.

Throughout this specification I have referred to the power-transmittingelement as having the form of a bell-crank lever, and while this form ispreferable by reason of its simplicity, light weight, 850., it isevident that in lieu thereof it is possible to employ any mechanicalelement capable of being swung upon a fulcrum and having saidfulcrumandthetype-barandkeyconnectionsdisposed so as to produce therelative movements of the key and type-bar necessary to the attainmentof the several objects stated. In Fig. 9, for instance, I have shown adisk 31, which may be substituted for the lever 16 without departingfrom the invention.

It is believed that the construction, operation, and many advantages ofthe invention will readily appear from the foregoing, and, while theillustrated embodiments thereof are believed at this time to bepreferable, I wish to reserve the right to efiect such changes,modifications,and variations of the illustrated structure as may beproperly embraced within the scope of the protection prayed.

\Vhat I claim isl. In a type-writing machine, the combination with atype-bar and a key, of a lever having operative connection with each ofsaid elements, the type-bar connection being disposed to assume alocking relation with the fulcrum of the lever in the normal positionthereof.

2. In a type-writing machine, the combination with a type-bar and a key,of a bell-cran k lever having operative connection with each of saidelements, the type-bar connection being disposed to assume a lockingrelation with the fulcrum of the lever in the normal position thereof.

3. In a type-writing machine, the combination with a typebar and a key,of a bell-crank lever having operative connection with the type-bar andkey, and also having a fixed fulcrum, the type-bar connection beingnormally located in position to bring the strain exerted thereon by thetype-bar substantially in line with the fulcrum of the lever, wherebythe type-bar is locked against rebound.

4. In a type-writing machine, the combination with a type-bar and a key,of a bell-crank lever having operative connection with the type-bar andkey, and also having a fixed fulcrum, the type-bar connection beingnormally located in position to bring the strain exerted thereon by thetype-bar substantially in line with the fulcrum of the lever to lock thetypebar against rebound, and the key connection being normally locatedin position to permit the swinging of the bell-crank lever by thedepression of the key.

5. In a type-writing machine, the combination with a type-bar and a key,of a bell-crank lever having operative connection with each of saidelements, and having a fixed fulcrum, the type-bar connection, the keyconnection and the fulcrum having a triangular arrangement, and thetype-bar connection being normally disposed to assume a locking relationwith the fulcrum of the lever to prevent the rebound of the type-bar.

6. In a type-writing machine, the combination with a type-bar and a key,of a bell-crank lever having operative connection with each of saidelements, and also havingafixed fulcrum, the fulcrum and the type-barconnection beinglocated at the ends of the bell-crank lever, and the keyconnection being located at the angle of the lever, said type-barconnection being disposed to assume a locking relation with the fulcrumof the lever in the of the lever in the normal position of said lever.

8. In a type-writing machine, the combination with a type-bar, akey-lever, and an interposed draw-Wire, of a bell-crank lever located inthe draw-wire and having a fixed fulcrum, and connections with thetype-bar and key-lever respectively, the connection of the lever withthe type-bar being disposed to assume a position substantially in a lineextending from the axis of the lever to that point of the type-barconnected with said lever, whereby the type-bar is locked againstrebounding movement.

9. In a type-writing machine, the combination with a type-bar and akey-lever, of a drawwire, and a bell-crank lever located in thedraw-wire and having a fixed fulcrum at one end, a connection at itsopposite end with that portion of the draw-wire extending to thetype-bar, and having a connection at its angle with that portion of thedraw-wire extending to the key-lever.

10. In a type-writing machine, the combination with a key and atype-bar, of a lever having connection with each of said elements, saidconnections being so related to the direction of movement of theconnected parts and to the fulcrum of the lever that the change ofposition of the lever will effect the decrease of the leverage of thekey upon the type-bar, and thus increase the speed of said type-barduring the printing stroke.

11. In a type-writing machine, the combination with a type-bar and akey, of a bellcrank lever having operative connection with each of saidelements, and having a fixed fulcrum,said connections being so disposedwith respect to the fulcrum that the speed of movement of the type-barwill be increased during the printing stroke.

12. In a type-writing machine, the combination with a key and atype-bar, of a bellcrank lever having connection with each of saidelements, said connections being so related to the direction of movementof the connected parts and to the fulcrum of the lever that the changeof position of the bellcrank lever will effect the decrease of theleverage of the key upon the type-bar and thus increase the speed ofsaid type-bar during the printing stroke.

13. In a type-Writing machine, the combination with the type-bar, akey-lever, and a vertical draw-wire, of a bell-crank lever located inthe draw-wire and having a fixed fulcrum, and connections with thekey-lever and type-bar respectively, said connections nection at itsopposite end with the type-bar, and a connection at its angle with thekeylever.

15. In a type-writing machine, the combination with a driving elementand a driven element, as for instance a key-lever and a type-bar, of abell-crank lever having connection with each of said elements, thedriving-element connection being initially movable through an aredisposed lengthwise of the line of movement of the connected part of thedriving element, and the driven-element connection being initiallymovable through an are disposed transversely of the line of movement ofthe connected part of the driven element, the swinging of said bellcranklever serving to change the relation of the parts to cause thedriving-element connection to move through an are disposed transverselyof the line of movement of the driving element, and to cause thedriven-element connection to move through an are disposed lengthwise ofthe line of movement of the driven element,whereby the leverage will bedecreased du ring the transmission of movement.

16. In a type-writing machine, the combination with a type-bar and key,of a lever having operative connection with each of said elements, saidconnections being so disposed that the speed of the type-bar will beincreased during the printing stroke, and said type-bar connection beingdisposed to assume a locking relation with the fulcrum of the lever inthe normal position thereof.

17. In a type-Writing machine, the combination with a type-bar and akey, of a bellcrank lever having operative connection with each of saidelements, said connections being so disposed that the speed of thetype-bar will be increased during the printing stroke, and said type-barconnection being disposed to assume a locking relation with the fulcrumof the lever in the normal position thereof.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

ROBERT JOSEPH FISHER.

Witnesses:

A. R. WVARNER, OHAs. F. LAGANKE.

